Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 128 for “"Large Deformations"”.
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Elastocapillarity: adhesion and large deformations of thin sheets
… in the regime of geometrically nonlinear deformations. We first consider the form of an elastic sheet that is partially adhered to a rigid substrate, accounting for deflections with large slope: the Sticky Elastica. Starting from the classical Euler Elastica we provide numerical results …
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Large deformations of thin plates subjected to impulsive loading
The dynamic response of structures subjected to blast and impact loading has been obtained relatively simply using rigid-plastic or rigid-viscoplastic material idealisations. It is essential, however, that the predictions of these idealised theories should be checked against experimental results, …
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Modeling of frame structures undergoing large deformations and large rotations
<p>Numerical simulation of large-scale problems in structural dynamics, such as structures subject to extreme loads, can provide useful insights into structural behavior while minimizing the need for expensive experimental testing for the same. These types of problems are highly non-linear and …
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Experimental methods to study plastic behavior of polymer glasses at large deformations
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1984.
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Influence of large deformations and midplane forces on the plastic behavior of impulsively loaded plates
… loaded plastic plates that includes effects of large deformations and midplane forces. Specifically, it deals with a circular plate of uniform thickness simply supported at its edges. The impulsive loading is characterized by an initial velocity distribution. The analysis assumes that the plate …
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A skeleton-and-bubble model of elastic open-cell foams for finite element analysis at large deformations
… conclude that the bubbles play a crucial role at large deformations, at least under certain loading conditions. Next, we turn our attention to the stretch fields. Of special interest to us are the two-phase stretch fields associated with a phase transition. These fields consist of mixtures of two …
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Variationally consistent methods for Lagrangian dynamics in continuum mechanics
… These problems are typically non-linear due to large deformations and/or non-linear constitutive relations. Such problems are typically modelled from a Lagrangian viewpoint, where the mesh is attached to the body; hence, large deformations lead to large distortions in the mesh. Explicit …
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Numerical simulation of friction welding processes: An arbitrary Lagrangian-Eulerian approach
… model is used, which is suited for the large deformations characteristic of friction welding processes, and which resolves the viscoplastic deformations in the thermomechanically affected zone as well as the elastic stresses in the parent material. To prevent the large deformations from …
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Finite Coupled Torsion and Inflation of Functionally Graded Mooney-Rivlin Cylinders with and without Residual Stresses
… and their orientations optimize functionality. Deformations of such structures typically involve bending, stretching, and shearing. An everyday example of shearing deformation is the twisting of wet fabrics to extract water. In this study, we analytically examine the large deformations of …
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A nonlinear interface formulation for frictional contact
… Meshes (NCM) are typically associated with large sliding or adaptive refinement on one side of the interface to capture localized nonlinear behavior due to large deformations, damage and inelasticity. The use of NCMs, however, presents a number of numerical issues; the main challenge with …
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Topology optimization of multimaterial and multiscale structures beyond elasticity: brittle fracture and ductile plasticity
… plasticity, and fracture under both small and large deformations. The framework embraces both rigorous physics-based methods and general machine learning approaches to predict design performance, which is iteratively improved through gradient-based optimization. The dissertation comprises five …
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An Investigation of the Floor Attachment Assembly of a Large Transport Aircraft Seat Subjected to Crash Dynamic Loadings
… track and seat-track fittings. Results showed large deformations and stresses above yielding in both the seat and track when subjected to accelerations prescribed for certification under the Federal Aviation Administration (FAA) regulations.</p>
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Mechanics of Beams and Plates with Variable Mechanical Properties
… 1: This paper mathematically investigates the large deformations of mechanical metamaterial beams with initial geometrical imperfections using a higher-order shear deformation theory. Importance of geometrical imperfections, graphene origami content and its distribution patterns, and the …
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Micromachined Sensors and Their Applications in the Study of Mechanical Response of Single Living Cells
… strongly linear, reversible and repeatable under large deformations, with a small stiffening at the initial deformation stage; Actin filaments play a dominant role in taking the cellular internal forces; Mechanical indentation/compression may induce actin agglomeration inside the cell, which …
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Splitting solution scheme for material point method
… tool which was originally used for modelling large deformations of solid mechanics problems. Due to the particle based spatial discretiza- tion, MPM is naturally capable of handling large mass movements together with topological changes. Further, the Lagrangian particles in MPM allow an easy …
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Formulações e métodos de solução na análise não-linear de treliças espaciais
… They make possible the nonlinear analysis of large displacements and large deformations. The structure is discretizeted by the finite element method, using the displacement model. The solution of the nonlinear equation system can be carried out by several incremental procedures: Newton …
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Evaluation of a direct time integration scheme for dynamic analysis
… accurate. However, in cases where there are large deformations and longer integration times, the trapezoidal rule fails. A new composite method scheme shows promise in maintaining stability where the trapezoidal rule fails. It is a two step method that makes use of the trapezoidal rule and …
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Vibration control and gust alleviation of highly flexible blended-wing-body aircraft
… gusts throughout their flights which can cause large deformations in the flexible, lightweight wings. These disturbances can potentially excite unstable modes within the flexible aircraft, depending on the flight speed and gust strength. In this thesis the open-loop and closed-loop dynamic …
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Integrated optimization system for airbag design and modeling by finite element analysis
… structure capable of undergoing large deformations with non-linear material properties, usually commercial software is used to conduct the analysis. In recent years, some efforts have been made to optimize the design of airbags and improve their performance, but integration of …
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The dynamic stability characteristics of damage-prone systems
… of a simple mechanical system, experiencing large deformations and inelastic material response with damage, is presented. Because the differential equations that describe the motion are highly nonlinear and coupled for the multi-degree-of-freedom system, a numerical procedure was employed to …
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